When one of Nancy's best friends, Bess, asked George to hold her locket while she jumped rope, George lost the locket. When Nancy went to investigate the missing locket, she found a clue - a peanut butter, mustard, ketchup and relish sandwich!

When Rebecca's slumber party invitations disappear, Nancy promises to try to find out who took them and why.

Nancy Drew's special detective notebook is gone, and boy, is she in trouble! She needs to find the notebook before Jason does, to prove she's a better detective.

The Morgans have come all the way from England to spend Thanksgiving with the Drews. When a gold ring disappears, Nancy decides to investigate and finds out something very unexpected.

It's almost Halloween, and Nancy can't wait. Not only does she get to dress up, but she and George are having a sleepover at Bess's house. Nancy's puppy finds an old key in Bess's backyard, and after Bess brings the key inside, it disappears. Someone is turning the trick-or-treating into one big trick!

When someone erases her name from a sign up list for skating flower girls, Nancy investigates.

When Nancy's English postage stamps disappear before she can display the on her pen pal poster for Parents' Night, she has to discover who has taken them, and why.

Nancy's teacher is getting married, and the whole class has chipped to get her a gift. Bess was put in charge of the money, and now she's horrified. The money has just disappeared!

Nancy and her friends open a lemonade stand in the park, but they find themselves out of business and on the trail of a mystery when their box of lemons is stolen.